DDR dilemma

I was planning on taking my iBook to Barnes & Noble to write a bunch of reviews, but the time got away from me. First I caught the last half hour of sun on my patio, then I decided to play some old-school DDR 3rd Mix. I wanted to try out Endless Mode, since I just recently unlocked it (my old mixes are kind of untapped since my moves weren't as good back then), but I couldn't get it to start. I would go to the Endless Mode screen, choose my settings, and then no matter what I stomped on, it wouldn't start! So, I tried digging around on the web, and before I knew it I had spent over an hour with nothing to show for it, and my iBook power was getting low. When I was giving up it dawned on me that since Endless Mode is a one-player game, maybe the controller has to be in the Player One slot (I always play in Player Two so I can pick the cute girl characters). I was right! So, I solved the mystery, but I didn't want to go out with a half-charged iBook, so I did a bunch of online Nihongo studying instead, which was fun anyway.